Author ：Iflowpower – Portable Power Station Supplier
1. After the operation of the solar component is completed, the power test is performed, and the component power is normal, but the customer has received the power attenuation when the component is installed and operated. Most of this phenomenon is caused by the photolithosis of the battery.
This article will systematically, briefly explain the phenomenon of photoloration. 2. Photoelectric attenuation of photovoltaic components can be divided into two stages: initial photolithonal decay and aging attenuation.
2.1 The initial photolithoma initial photolithosis, that is, the output power of the photovoltaic module has a large decline in the initial days of initial use, but then tends to stabilize. An important reason that causes this phenomenon is that the borogenic complex in the p-type (borborid) crystalline silicon is lowered.
By changing the p-type dopant, the photovollection of the photovollection is effectively reduced by replacement boron; or the battery sheet is preconwarding, which is the initial photolithonal attenuation of the battery before the assembly. It can be controlled within a small range while also improving the output stability of the component. Photocatalysts are related to battery packs, and the meaning of component manufacturers is to select high-quality battery slices to reduce the influence of photoloration.
2.2. Aging attenuation aging decline refers to the slow power decline in long-term use, and the important cause of the battery is related to the slow attenuation of the battery, and it is also related to the performance degradation of the package material.
Among them, it is an important reason for the degradation of component maintenance performance during irradiation of ultraviolet light. Long-term irradiation of ultraviolet rays, allows EVA and backplane (TPE structure) aged yellow-changing phenomenon, causing the light transmittance of the assembly to fall, and caused power to drop. This requires that component vendors must strictly control when choosing EVA and backplanes, and the selected materials must be very excellent in aging resistance to reduce the aggregate reduction due to aggregate aging.
3. The early photo attenuation phenomenon of the p-type (borborid) crystal silicon solar cell is observed more than 30 years ago, and then people have conducted a lot of scientific research. In particular, in recent years, scientific research found that it is related to the boron oxygen concentration in the silicon wafer, and everyone's substantially consistent view is illuminated or currently inhibiting boron and oxygen in the silicon wafer to form boron oxygen complexes, thereby reducing the child life However, after annealing, the less life can be recovered, and the possible reaction is: According to the literature, the silicon-containing silicon-containing silicon film will have different degrees of decay after the light, and boron, oxygen in the silicon wafer.
The larger the content, the more boraboalaxic composites that appear in the body under illumination or current incident, the greater the increase in the lowest life. In low oxygen, blended, a phosphorous silicon wafer, its colossono life has increased with the new time of photographing, the overall decay is extremely small. 4.
Solution 4.1. Improve the early photolithix phenomena of the performance of silicon single crystal quality solar cells Important on single crystal silicon solar cells, and the early photolithonal attenuation amplitude of the conversion efficiency is small.
Thus, the properties of the silicon plate itself determine the degree of early photorelation of solar cell performance. Therefore, to solve the early photolithosis problem of photovoltaic components. It is necessary to solve the silicon problem.
The following will discuss several methods. A. The quality of some single crystal bars that improve the boron-doped straight single crystal silicon rod is really worrying.
If this condition will seriously affect the healthy development of the photovoltaic industry in the blend of Dragonflite single crystal products Improving problems and improvements in China: 1) Since the original high-purity polycrystalline silicon shortage, some pull rod companies have blended some mass of macerates that should not be used and other harmful impurities contents. Solar batteries produced using such materials are not only low efficient, but the early photolithosis is very large. We strongly ask for low quality silicon materials.
2) Waste N-type silicon wafers in high-purity polycrystalline silicon blends in high-purity polycrystalline silicon materials, etc. The boron silicon rod manufactured is a high compensated P-type single crystal material. Although the resistivity is suitable, the boron oxygen concentration is highly high, resulting in a larger photolithonal attenuation of the solar cell performance.
We strongly require no low resistivity N-type silicon. 3) Some companies pull the rod process is not limited, the oxygen content in crystalline silicon is too high, the internal stress is large, the dislocation defect is high, and the resistivity is uneven, all affect the efficiency and stability of the solar cell. We wish to improve the pull craft.
Control oxygen content. The solar cell made of the above silicon wafer has a larger photolithonal attenuation, which will exceed the scope of the customer acceptable. In fact, the straight pull single crystal process is mature.
As long as we put the quality of the material, according to the formal rod process, the quality of the silicon rod can be better controlled. B. Improved single crystal silicon rod product quality This process can not only control the oxygen concentration in single crystals, but also improve the silicon single crystal, radial resistivity uniformity.
The process has started trial in China. C. Improved Single Crystal Silicon Process (FZ) to improve the single crystal silicon process by the regional molten single crystal silicon process (Fz) to prevent a large amount of oxygen in the liquid silicon crystal in the straight pull process, thus thoroughly solving P-type (boron boron) ) Early photolithix phenomenon of solar cells.
Due to the high cost of FZ, it is important for silicon wafers for IC and other semiconductor devices, but some companies have renovated FZ process, reducing costs. Made of solar battery silicon wafers. Some of the domestic rods have carried out this aspect of the test work D, changing the dopant, using a battery made of a silicon-doped silicon with ballium, did not find the early photorealic phenomenon of the solar cell, but also solved the early stage of the solar cell.
One of the ways. E, use the p-type N-type silicon-doped N-type silicon sheet using a silicon wafer and a method of solving the problem of the initial testing of the battery, but from the current industrialized screen printing 诰 battery process, 诰There is no advantage in conversion efficiency and manufacturing costs. Some key processes are needed to resolve 4.
2. A previous illumination attenuation of the battery is caused by the early photo attenuation of the photovoltaic assembly, and the battery is illuminated. Plearance, so that the early photoa of the battery occurs before the component is manufactured.
Early photolithonization of photovoltaic components is very small, can be controlled within measurement errors. At the same time, it also greatly reduces the chance of hot spots in photovoltaic components. 5.
Summary increases the output stability of photovoltaic components, bringing more benefits for our users. Despite the light prediments, it is a method of replenishing the prisoner, but before the quality of the silicon wafer is not effectively improved, the use of this method is to solve the effective measures for the early photolithitation of photovoltaic components.
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